2216123661 has 8 divisors (see below), whose sum is σ = 2956022080. Its totient is φ = 1476820512.

The previous prime is 2216123627. The next prime is 2216123687. The reversal of 2216123661 is 1663216122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2216123661 - 2¹¹ = 2216121613 is a prime.

It is a super-2 number, since 2×2216123661² = 9822408161688085842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2216128661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140056 + ... + 155073.

It is an arithmetic number, because the mean of its divisors is an integer number (369502760).

Almost surely, 2^2216123661 is an apocalyptic number.

It is an amenable number.

2216123661 is a deficient number, since it is larger than the sum of its proper divisors (739898419).

2216123661 is a wasteful number, since it uses less digits than its factorization.

2216123661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297635.

The product of its digits is 5184, while the sum is 30.

The square root of 2216123661 is about 47075.7226285481. The cubic root of 2216123661 is about 1303.7610336959.

Adding to 2216123661 its reverse (1663216122), we get a palindrome (3879339783).

The spelling of 2216123661 in words is "two billion, two hundred sixteen million, one hundred twenty-three thousand, six hundred sixty-one".